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A new formation of the Cambrian Tonto Group, Grand Canyon formally named for Frenchman Mountain
Oxytropidoceras posted a topic in Fossil News
Frenchman Mountain Dolostone: 500 million-year-old Grand Canyon rock layer finally gets a name. UNLV geologists name ancient rock layer after Las Vegas mountain that contains similar strata; research published in the journal Geosphere. New Study Links Geologic Features of Las Vegas’ Frenchman Mountain with Grand Canyon. Las Vegas Valley rock layer matches that of a famous interval of rocks at the Grand Canyon; findings reported in the Journal Geology. University of Nevada at Las Vegas, May 1 , 2020 The open access paper is: Rowland, S.M., Korolev, S., Hagadorn, J.W. and Ghosh, K., 2023. Frenchman Mountain Dolostone: A new formation of the Cambrian Tonto Group, Grand Canyon and Basin and Range, USA. Geosphere. Supplemental Material: Frenchman Mountain Dolostone: A new formation of the Cambrian Tonto Group, Grand Canyon and Basin and Range, USA, Geological Society of America Another paper is: Karlstrom, K.E., Mohr, M.T., Schmitz, M.D., Sundberg, F.A., Rowland, S.M., Blakey, R., Foster, J.R., Crossey, L.J., Dehler, C.M. and Hagadorn, J.W., 2020. Redefining the Tonto Group of Grand Canyon and recalibrating the Cambrian time scale. Geology, 48(5), pp.425-430. Related papers: Rowland, S.M., 2022, Geology of Frenchman Mountain and Rainbow Gardens, southern Nevada, USA, in Jiang, G.Q., and Dehler, C., eds., Field Excursions from Las Vegas, Nevada: Guides to the 2022 GSA Cordilleran and Rocky Mountain Joint Section Meeting: Geological Society of America Field Guide 63, p. 23– 43. Rowland, S.M., 1987, Paleozoic stratigraphy of Frenchman Mountain, Clark County, Nevada, in Hill, M.L., ed., Cordilleran Section of the Geological Society of America: Geological Society of America Centennial Field Guide 1, p. 53– 56. Hollingsworth, J.S., Sundberg, F.A. and Foster, J.R., 2011. Cambrian stratigraphy and paleontology of Northern Arizona and Southern Nevada. Museum of Northern Arizona Bulletin, 67, pp.1-321. PDFs of more trilobite papers. Videos Wild Speaker Series: The Amazing Geology of Frenchman Mountain and Rainbow Gardens. Friends Of Nevada Wilderness Frenchman Mountain Loop | Bordering Lake Mead National Nevada Trilobites, Frenchman Mountain Yours, Paul H. -
I’m hoping to ID two fossils. The first fossil was found in the Boone Formation of Northwest Arkansas. My first thought is ammonite, but the spiral is much looser than what I’m seeing online. The second fossil was found 10-50 miles south of the south rim of the Grand Canyon in Arizona. It was a while ago, can’t remember exactly where I was. Both are about an inch across. Thanks for your help!
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The strange race to track down a missing billion years (The Great Unconformity)
Oxytropidoceras posted a topic in Fossil News
The strange race to track down a missing billion years Zaria Gorvett, BBC News, September 1, 2021 A billion years have vanished from the geological record – and over 152 years after this was first discovered, scientists can't agree on why. Some papers: Peters, S.E. and Gaines, R.R., 2012. Formation of the ‘Great Unconformity’as a trigger for the Cambrian explosion. Nature, 484(7394), pp.363-366. Keller, C.B., Husson, J.M., Mitchell, R.N., Bottke, W.F., Gernon, T.M., Boehnke, P., Bell, E.A., Swanson-Hysell, N.L. and Peters, S.E., 2019. Neoproterozoic glacial origin of the Great Unconformity. Proceedings of the National Academy of Sciences, 116(4), pp.1136-1145. Open access Marshak, S., Domrois, S., Abert, C., Larson, T., Pavlis, G., Hamburger, M., Yang, X., Gilbert, H. and Chen, C., 2017. The basement revealed: Tectonic insight from a digital elevation model of the Great Unconformity, USA cratonic platform. Geology, 45(5), pp.391-394. Yours, Paul H.-
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Ancient Colorado River mystery solved: Ancient shallow sea with strong tides. University of Oregon. December 17, 2020 https://www.sciencedaily.com/releases/2020/12/201217092354.htm The papers are: Dorsey, R.J., O'Connell, B., McDougall, K. and Homan, M.B., 2018. Punctuated sediment discharge during early Pliocene birth of the Colorado River: Evidence from regional stratigraphy, sedimentology, and paleontology. Sedimentary Geology, 363, pp.1-33. https://eartharxiv.org/repository/view/1542/ https://www.researchgate.net/publication/320147485_Punctuated_Sediment_Discharge_During_Early_Pliocene_Birth_of_the_Colorado_River_Evidence_from_Regional_Stratigraphy_Sedimentology_and_Paleontology https://www.researchgate.net/profile/Rebecca_Dorsey Kevin Gardner, Rebecca J. Dorsey. Mixed carbonate-siliciclastic sedimentation at the margin of a late Miocene tidal strait, lower Colorado River Valley, southwestern USA. Sedimentology, 2020. Brennan O'Connell, Rebecca J. Dorsey, Stephen T. Hasiotis, Ashleigh v.s. Hood. Mixed carbonate-siliciclastic tidal sedimentation in the Miocene to Pliocene Bouse Formation, palaeo-Gulf of California. Sedimentology, 2020. https://eartharxiv.org/repository/view/1878/ Yours, Paul H.
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Hello! I am not a serious fossil collector, but I am always on the lookout for fossils when I am around exposed rock. I was hoping the members of this site could tell me if they thought this rock was a fossilized egg. I was struck by its shape and its texture. I photographed it in the Grand Canyon on the trail between Phantom Ranch and Cottonwood Campground. It measures about 5 inches squared. Thank you for your thoughts!
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Mapping Grand Canyon – Over 150 Years of Cartographic Change Arizona State University Library, February 28. 2019 https://lib.asu.edu/mapping-grand-canyon-conference/program Geologic Mapping of Grand Canyon, 150 Years and Counting Karl E. Karlstrom, Arizona State University Library, February 28. 2019 https://lib.asu.edu/mapping-grand-canyon-conference/program/geologic-mapping-150 Find a National Park Service Map https://www.nps.gov/carto/app/#!/parks Grand Canyon National Park Maps https://www.nps.gov/carto/app/#!/maps/alphacode/GRCA https://www.nps.gov/carto/app/#!/parks/state/az Grand Canyon National Park Geologic Diagram https://www.nps.gov/carto/app/#!/maps/alphacode/GRCA Heinrich Berann Panoramas National Parks Maps by Category https://www.nps.gov/carto/app/#!/maps/categories/12 https://en.wikipedia.org/wiki/Heinrich_C._Berann Yours, Paul H.
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Amniote tetrapods documented in two Pennsylvanian Grand Canyon trackways
Oxytropidoceras posted a topic in Fossil News
Discovered fossil tracks determined to be oldest known in Grand Canyon National Park ABC, Channel 15 News, Arizona The open access paper is: Rowland, S.M., Caputo, M.V., and Jensen, Z.A., 2020. Early adaptation to eolian sand dunes by basal amniotes is documented in two Pennsylvanian Grand Canyon trackways. PLoS ONE 15(8): e0237636. A related paper is: Francischini, H., Lucas, S.G., Voigt, S., Marchetti, L., Santucci, V.L., Knight, C.L., Wood, J.R., Dentzien-Dias, P. and Schultz, C.L., 2020. On the ;presence of Ichniotherium in the Coconino Sandstone (Cisuralian) of the Grand Canyon and remarks on the occupation of deserts by non-amniote tetrapods. PalZ, 94(1), pp.207-225. Yours, Paul H. -
Need help remembering the geological layers in the Grand Canyon? Check out this rap video. Certainly much more interesting than listening to a “song” about life of crime in the hood. https://www.youtube.com/watch?v=3ZsLczCO3D4&feature=youtu.be&app=desktop
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Spamer, E. E., 2019. Bibliography of Paleontology of the Grand Canyon Region and in the Continuity of Grand Canyon Formations. Ravem Perch Media. https://ravensperch.org/bibliography-of-paleontology-of-the-grand-canyon-region/ https://www.academia.edu/39128385/Bibliography_of_Paleontology_of_the_Grand_Canyon_Region_and_in_the_Continuity_of_Grand_Canyon_Formations https://amphilsoc.academia.edu/EarleSpamer Spamer, E.E., 1984, Paleontology in the Grand Canyon of Arizona: 125 years of lessons and enigmas from the late Precambrian to the present: Mosasaur (Journal of the Delaware Valley Paleontological Society), v. 2, p. 45-128. https://sites.google.com/site/dvpspaleo/home/the-mosasaur/Mosasaur-Vol2-1984-Spammer-GrandCanyon-45-128.pdf https://sites.google.com/site/dvpspaleo/home/the-mosasaur/ https://www.academia.edu/36824895/Paleontology_in_the_Grand_Canyon_of_Arizona_125_Years_of_Lessons_and_Enigmas_from_the_Precambrian_to_the_Present On a lighter note: Spamer, E.E., 1955. The Okamura Fossil Laboratory. The Annals of Improbable Research. v. 1, no. 4, pp. 4-9. https://www.academia.edu/36778876/The_Okamura_Fossil_Laboratory_and_Was_Darwin_nearly_right Yous, Paul H.
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Hi Folks, I've been holding onto this for years as it always looked like a tooth to me. Any help would be appreciated. I found it while hiking at the North Rim of the Grand Canyon in the 90's. Probably a rock just wanted see what others thought.
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I remember seeing Trackways in the Cocconino Sandstone as a kid in the Grand Canyon. These are not the ones I've seen before. Almost 100 years after the first paper out of the Grand Canyon is one describing an icnotaxa unexpected in the Permian desert. https://phys.org/news/2019-05-newly-fossil-footprints-paleontologists-rethink.amp
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Oldest known footprints in the Grand Canyon found
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So in late June early July my wife, 2 boys (8 & 2.5), my father in-law and mother-in-law and I are going to take a 2 week road trip around the US. We'll be leaving Maryland and heading down to Memphis, Tennessee followed by Nashville then on to Texas and ending up in Albuquerque, New Mexico at my brother-in-law's for a few days, then off to the Grand Canyon, up to Dinosaur National monument, over to Hot Springs, South Dakota to the Mammoth site, Mt Rushmore, and Crazy Horse Monument, then to the Badlands in South Dakota, and then start making our way back to home. We're taking some new paths and going back over some previous ones. I am interested in doing 1-2 hour fossil and/or rock and mineral collecting leg stretches not terribly far off US 40 between Memphis and Albuquerque. Honestly anywhere else near the places I listed and anywhere along US 90 back to Chicago and down to Indianapolis, then US 70 the rest of the way east towards home. I'm hoping if I ask on here I can get a handful of options for the trip, we may only do two or three depending on time, weather and general feedback from the rest of the family. I have messaged PFooley about the Albuquerque/Rio Puerco area. After we get back I will have to make a write up of the adventure, it should be a great trip full of geologic and paleontological fun. Thanks for any information, Adam
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